<template>
  <div>
        <!-- 面包屑导航区域 -->
       <el-breadcrumb separator="/">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>分类参数</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图区域 -->
        <el-card>
            <!-- 头部警告区域 -->
             <el-alert
                title="注意:只允许为第三级分类设置相关参数"
                type="warning"
                show-icon
                :closable='false'>
            </el-alert>
            <!-- 选择商品分类区域 -->
            <el-row class="cat_opt">
                <el-col>
                    <span>
                        选择商品分类:
                    </span>
                    <!-- 选择商品分类的级联选择框 -->
                     <el-cascader
                        v-model="selectedCateKeys"
                        :options="cateList"
                        :props="cateProps"
                        @change="handleChange">
                    </el-cascader>
                </el-col>
            </el-row>
            <!-- tab标签页 -->
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
                <!-- 添加动态参数面板 -->
                <el-tab-pane label="动态参数" name="many">
                    <el-button type='primary' size='mini' :disabled='isBtnDisabled' class="cat_opt"  @click="addDialogVisible =true">添加参数</el-button>
                    <!-- 动态参数表格 -->
                    <el-table :data="manyTableData" border stripe>
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染tag标签 -->
                                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close='handleClose(scope.row,i)'>
                                    {{item}}
                                </el-tag>
                                <el-input
                                    class="input-new-tag"
                                    v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue"
                                    ref="saveTagInput"
                                    size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)"
                                    >
                                </el-input>
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <el-table-column type="index" label="#"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button type="primary" icon="el-icon-edit" size='mini' @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" icon="el-icon-delete" size='mini' @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <!-- 添加静态属性面板 -->
                <el-tab-pane label="静态属性" name="only">
                     <el-button type='primary' size='mini' :disabled='isBtnDisabled' class="cat_opt" @click="addDialogVisible =true">添加属性</el-button>

                     <el-table :data="onlyTableData" border stripe>
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染tag标签 -->
                                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close='handleClose(scope.row,i)'>
                                    {{item}}
                                </el-tag>
                                <el-input
                                    class="input-new-tag"
                                    v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue"
                                    ref="saveTagInput"
                                    size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)"
                                    >
                                </el-input>
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <el-table-column type="index" label="#"></el-table-column>
                        <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button type="primary" icon="el-icon-edit" size='mini' @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" icon="el-icon-delete" size='mini'  @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>

            </el-tabs>
        </el-card>
        <!-- 添加参数对话框 -->
        <el-dialog
            :title="'添加' + titleText"
            :visible.sync="addDialogVisible"
            width="50%"
            @close='addDialogClosed'
            >
            <el-form :model="addForm" :rules="addRules" ref="addRuleForm" label-width="100px" >
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>
        <!-- 修改餐宿对话框 -->
        <el-dialog
            :title="'修改' + titleText"
            :visible.sync="editDialogVisible"
            width="50%"
            @close='editDialogClosed'
            >
            <el-form :model="editForm" :rules="editRules" ref="editRuleForm" label-width="100px" >
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="editForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
        </el-dialog>
  </div>
</template>

<script>
export default {
  data () {
    return {
      cateList: [], // 商品分类列表
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      }, // 这是级联选择框配置对象
      selectedCateKeys: [], // 这是级联选择框绑定的双向数组
      activeName: 'many', // 这是被激活的事件名称
      manyTableData: [], // 动态参数列表
      onlyTableData: [], // 静态参数列表
      addDialogVisible: false, // 这是控制添加对话框的显示与隐藏
      addForm: {
        attr_name: ''
      }, // 添加参数表单数据对象
      addRules: {
        attr_name: [
          {
            required: 'true', message: '请输入参数名称', trigger: 'blur'
          }
        ]
      },
      editDialogVisible: false, // 控制修改对话框的显示与隐藏
      editForm: { // 修改表单数据对象
        attr_name: ''
      },
      editRules: { // 修改表单的验证规则
        attr_name: [
          {
            required: 'true', message: '请修改参数名称', trigger: 'blur'
          }
        ]
      }

    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    // 获取所有的商品分类列表
    async getCateList () {
      const { data: res } = await this.$http.get('/categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类列表失败!')
      }
      this.cateList = res.data
    },
    // 级联选择框中选项变化,会触发这个函数
    handleChange () {
      this.getParamsData()
    },
    // 这是tab页签点击事件的处理函数
    handleTabClick () {
      this.getParamsData()
    },

    async getParamsData () {
      // 选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      // 根据所选分类的id和当前所处的面板,获取对应参数
      const { data: res } = await this.$http.get(`/categories/${this.cateid}/attributes`,
        { params: { sel: this.activeName } })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败')
      }
      res.data.map(item => {
        if (item.attr_vals) {
          item.attr_vals = item.attr_vals.split(' ')
        } else {
          item.attr_vals = []
        }
        item.inputVisible = false
        item.inputValue = ''
      })
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // 监听添加对话框的关闭事件
    addDialogClosed () {
      this.$refs.addRuleForm.resetFields()
    },
    // 点击按钮添加参数
    addParams () {
      this.$refs.addRuleForm.validate(async (valid) => {
        if (!valid) return
        const { data: res } = await this.$http.post(`/categories/${this.cateid}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })

        if (res.meta.status !== 201) {
          return this.$message.error('添加参数失败!')
        }
        this.$message.success('添加参数成功!')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    // 点击按钮展示修改对话框
    async showEditDialog (id) {
      const { data: res } = await this.$http.get(`/categories/${this.cateid}/attributes/${id}`, {
        params: {
          attr_sel: this.activeName
        }
      })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数失败!')
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    // 监听修改对话框的关闭事件
    editDialogClosed () {
      this.$refs.editRuleForm.resetFields()
    },
    // 点击按钮修改对应参数
    editParams () {
      this.$refs.editRuleForm.validate(async (valid) => {
        if (!valid) return
        const { data: res } = await this.$http.put(`/categories/${this.cateid}/attributes/
               ${this.editForm.attr_id}`, {
          attr_name: this.editForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 200) {
          return this.$message.error('修改参数失败!')
        }
        this.$message.success('修改参数成功!')
        this.editDialogVisible = false
        this.getParamsData()
      })
    },
    // 根据id删除对应的参数向
    async removeParams (id) {
      const result = await this.$confirm('此操作将永久删除该参数,是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (result !== 'confirm') {
        return this.$message.info('已取消删除!')
      }

      const { data: res } = await this.$http.delete(`/categories/${this.cateid}/attributes/${id}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除参数失败!')
      }
      this.$message.success('删除成功!')
      this.getParamsData()
    },
    // 文本框失去焦点或按下了enter键都会触发
    async handleInputConfirm (row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      // 如果没有return,则证明需要后续处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      this.saveAttrValues(row)
    },
    // 点击按钮,展示文本输入框
    showInput (row) {
      row.inputVisible = true
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 删除tag标签的参数可选项
    handleClose (row, i) {
      row.attr_vals.splice(i, 1)
      this.saveAttrValues(row)
    },
    async saveAttrValues (row) {
      // 需要发起请求,保存这次操作
      const { data: res } = await this.$http.put(`/categories/${this.cateid}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' ')
      })
      if (res.meta.status !== 200) {
        return this.$message.error('修改参数失败1')
      }
      this.$message.success('修改参数成功!')
    }

  },
  computed: {
    // 如果按钮需要被禁用,则返回true,否则为false
    isBtnDisabled () {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    // 当前选中的三级分类的id
    cateid () {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    // 动态计算标题文本
    titleText () {
      if (this.activeName === 'many') {
        return '动态参数'
      } else {
        return '静态属性'
      }
    }
  }
}
</script>

<style lang="less" scoped>
    .cat_opt{
        margin: 15px 0;
    }
    .el-tag{
        margin: 10px;
    }
    .input-new-tag{
        width: 100px;
    }
</style>
